No gemstone has a stronger reputation for durability than diamond, and that reputation is grounded in crystal structure rather than marketing. Its exceptional hardness, high lustre, and ability to return crisp light make it central to both jewellery and industrial applications.

Goshenite is often discussed with one eye on colour and the other on where the material comes from. That combination of blue body colour, 7.5 Mohs hardness, and vitreous lustre is what usually makes it recognisable in practice. The secondary green note often matters more than people expect when separating it from lookalikes.